Exploitation technology of pressure relief coalbed methane in vertical surface wells in the Huainan coal mining area

• Published in: 矿业科学技术（英文版） Vol. 19; no. 1; pp. 25 - 30
• Main Authors: HAN Jia-zhang, SANG Shu-xun, CHENG Zhi-zhong, HUANG Hua-zhou
• Format: Journal Article
• Language: English
• Published: Huainan Mining Group, Huainan, Anhui 232000, China%School of Resource and Geoscience, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China 2009; School of Resource and Geoscience, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
• Subjects: exploitation; vertical surface well; Hualnan coal mining area; pressure relief coalbed methane
• ISSN: 1674-5264
• DOI: 10.3969/j.issn.2095-2686.2009.01.005

TD8; Exploitation technology of pressure relief coalbed methane in vertical surface wells is a new method for exploration of gas and coalbed methane exploitation in mining areas with high concentrations of gas, where tectonic coal developed. Studies on vertical surface well technology in the Huainan Coal Mining area play a role in demonstration in the use of clean, new energy re-sources, preventing and reducing coal mine gas accidents and protecting the environment. Based on the practice of gas drainage engineering of pressure relief coalbed methane in vertical surface wells and combined with relative geological and exploration en-gineering theories, the design principles of design and structure of wells of pressure relief coaibed methane in vertical surface wells are studied. The effects of extraction and their causes are discussed and the impact of geological conditions on gas production of the vertical surface wells are analyzed. The results indicate that in mining areas with high concentrations of gas, where tectonic coal developed, a success rate of pressure relief coalbed methane in surface vertical well is high and single well production usually great. But deformation due to coal exploitation could damage boreholes and cause breaks in the connection between aquifers and bore-holes, which could induce a decrease, even a complete halt in gas production of a single well. The design of well site location and wellbore configuration are the key for technology. The development of the geological conditions for coalbed methane have a sig-nificant effect on gas production of coalbed methane wells.